. >> pelley: first lady michelle obama set out three years ago to fight childhood obesity. it's her signature program. so today, she flew to clinton, mississippi, to congratulate school officials for offering healthful meals to the students. mississippi has one of the highest obesity rates in the nation, but among elementary students it has dropped by 13% recently. dr. jon lapook sat down with the first lady there today. jon. >> reporter: scott, one big problem here in mississippi is that most parents of obese kids don't realize that their kids are obese. in fact, despite recent improvement, 41% of public school kids are either overweight or obese, yet only 15% of parents say their kids are overweight or obese. i asked the first lady about that. >> well, we still have work to do, and that's one of the reasons why we're focusing on information and providing information, stronger communication for parents so that they have the information they need to make the healthy choice, the easier and affordable choice. >> reporter: what do you do about the kid who's home, he's watching